176 Chapter 30 Modem installation
NN10600-175 6.1S2
Table 1
Pinout for the DB 9-pin connecting to the modem DB 25-pin
DB
9-pin
DB
25-pin
Signal name of the device to modem Direction at
the device
2 3 transmitted data [TXD] / received data (Rx) input
3 2 received data [RXD] / transmitted data (Tx) output
4 8 data terminal ready [DTR] / data carrier
detect (CD)
input
5 7 signal ground [GND] not applicable
6 20 data carrier detect [DCD] / data terminal
ready (DTR)
output
7 5 request to send [RTS] / clear to send (CTS) input
8 4 clear to send [CTS] / request to send (RTS) output
Note: Text in square brackets [ ] indicates the signal terminology
used in NTPs. Text in parenthesis ( ) indicates the signal terminology
commonly used by modem venders.
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